2-Pack Offer U.S. Merino Wool: We source our 100% U.S. grown merino wool exclusively from sheep raised by American farmers on American farms. Merino wool keeps you cool in the summer and warm in winter. The Boulder is a traditional hiking sock that has exactly what you need: durability, comfort, and all-season versatility. Reinforced construction and low-stress seam placement reduce wear and tear, increasing the life of the sock. Advanced knitting techniques create a totally seamless toe closure in the toe box, reducing bulk and eliminating blister-generating friction. Single or 2-Pack options! The Boulder Medium Weight is a medium-weight traditional hiking sock, ideal for colder temperatures. It features our outer plaiting construction, which surrounds the softer body yarns with more durable stretch yarns for better insulation and improved longevity. Top-to-toe full-density padding cushions the instep and entire leg shaft when wearing heavy boots, and US-grown merino wool provides exceptional insulation, even when wet with snow or perspiration.